Our main result is that the lightcurve for an observer that is not too close to the polar direction might have an abrupt drop.
This is similar to the results of [1]} who built a bipolar explosion toy model. We went beyond the toy model by conducting hydrodynamical simulations of jet-driven supernova explosion into a bipolar CSM (section ) and used the bipolar ejecta-CSM regions to calculate the luminosity as we explained in section REF . Despite the limitation of our scheme, the qualitative results are robust. Exact fittings of specific cases will require more accurate calculations, in particular the inclusion of radiative transfer and a more systematic search of the (large) parameter space. Nonetheless, as we show next we can qualitatively explain the light curve of SN 2018don.
